Most current ios for iphone 1?

I'm not going to get one to use as a phone. I'm getting one to replace my broken ipod touch. Can it be updated to ios 6? Please answer? If not can you do it with a 2nd gen iphone?

IPhone 1 (original): Highest is iOS 3.1.3
iPhone 3G: Highest is iOS 4.2.1
iPhone 3GS: Highest is iOS 6.1.3
iPhone 4: Highest is iOS 6.1.3 (beta of iOS 7 is available and will run on it)
iPhone 4S: Highest is iOS 6.1.3 (beta of iOS 7 is available and will run on it)
iPhone 5: Highest iOS is iOS 6.1.4 (beta of iOS 7 is available and will run on it)

So if you want the latest iOS update possible, I would recommend new hardware. I would go with at least an iPhone 4 or higher. IPhone 1 and iPhone 3G are both too old. Or perhaps an iPod Touch 5th gen as that will run iOS 7. But if you only want iOS 6, you can get an iPhone 3GS or an iPod Touch 4th gen too.